It doesn't survive for long outside of the body, you'll be fine but feel free if it makes you feel better.
Can survive 12 hrs in the air and up to 3 days on surfaces depending on conditions apparently. I think masks fall down because you can still contaminate them and transfer or breathe in through gaps if they don't fit properly though.
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It doesn't survive for long outside of the body, you'll be fine but feel free if it makes you feel better.